JP2019095040A - Manufacturing method of spline telescopic shaft - Google Patents

Abstract

To precisely form a finished resin coating layer by making an outer shaft and an inner shaft of a spline telescopic shaft slide while centralizing the outer shaft and the inner shaft to each other.SOLUTION: An unfinished resin coating layer 4 is formed by coating at least either of an inner spline 2a and an outer spline 3a with a resin material, an inner shaft 3 and an outer shaft 2 in which the unfinished resin coating layer 4 is formed are coupled to each other so that an outer spline 3a and an inner spline 2a can slide with respect to each other, an inner-shaft side jig 30 and an outer-shaft side jig 20 are made to relatively reciprocate along an axial direction of an intermediate shaft 1 in a state that a lower end of the inner shaft 3 is grasped by the inner-shaft side jig 30, an upper end of the outer shaft 2 is grasped by the outer-shaft side jig 20, and the lower end of the inner shaft 3 and the upper end of the outer shaft 2 are grasped, and the finished resin coating layer 4 is formed by making the unfinished resin coating layer 4 follow the corresponding outer spline 3a or the inner spline 2a while centralizing the inner shaft 3 or the outer shaft 2 to each other at least at either of the inner-shaft side jig 30 and the outer-shaft side jig 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method of manufacturing a spline telescopic shaft such as an intermediate shaft that transmits steering force in a vehicle steering system.

  Conventionally, an intermediate shaft, which is one of the spline extension shafts of this type, has a spline (inner shaft) and a sleeve (outer shaft) with as little play as possible in order to improve the steering feeling of the steering wheel. The play is required to be, for example, 5 μm or less, and the sliding load accompanying expansion and contraction is required to be low. Therefore, a resin coating layer is applied to the outer splines of the inner shaft. For example, with the outer diameter of the resin coating layer before finishing and the inner diameter of the outer shaft in a negative clearance state, the inner shaft and the outer shaft slide at high speed to melt the resin on the surface by frictional heat, spline teeth on the outer shaft side It forms a tooth flank on the inner shaft side to be fitted to the face. As a result, the frictional resistance between the teeth of the inner shaft and the outer shaft is reduced, wear of both teeth is suppressed, and rattling between the two shafts in the initial use of the extension shaft is reduced. In addition, the sliding load between the two axes can be reduced, thereby facilitating the assembly work of the telescopic shaft to a vehicle or the like and improving the durability, and suppressing the stick-slip vibration between the two axes. And quietness are improved (see, for example, Patent Document 1).

JP, 2011-38561, A

  The inner shaft of the intermediate, which has become mainstream in recent years, is usually equipped with a universal joint. The universal joint can reliably transmit the rotational torque because the rotational angle does not change even if the angle changes freely. Taking advantage of the characteristic that the angle changes freely and the rotation angle does not change, the inner shaft and the outer shaft follow each other by clamping and sliding one of the two joints in one set, That is, the resin coating layer of the inner shaft is uniformly formed while being centered.

  However, it is also assumed that the universal joint is not attached at the stage of finishing the resin coating layer, and in such a case, if the inner shaft and the outer shaft have different cores when clamping the inner shaft The resin coating layer can not be formed as it is slid as it is and a uniform finish is obtained. Therefore, a device for forming a uniform resin coating layer is required.

  The present invention has been made in view of such a point, and an object of the present invention is to provide an outer shaft and an inner shaft, even if the spline telescopic shaft is in a difficult-to-clamp state where no universal joint is provided. It is to make it possible to finish the resin coating layer simply and accurately by sliding in a state where the centering is performed.

  In order to achieve the above object, in the present invention, at least one of the outer shaft and the inner shaft is moved while being moved in the radial direction and made to slide while centripetal to finish the resin coating layer.

Specifically, in the first invention,
An outer shaft having an inner spline formed on an inner circumferential surface,
An outer shaft is formed on the outer peripheral surface, and an inner shaft slidably coupled with the outer spline and the inner spline,
In a method of manufacturing a spline telescopic shaft in which at least one of the inner spline and the outer spline is coated with a resin coating layer,
A resin coating layer forming step prior to finishing, wherein at least one of the inner spline and the outer spline is coated with a resin material to form the resin coating layer;
Combining the inner shaft and the outer shaft on which the resin coating layer before the finish is formed so that the outer spline and the inner spline can slide.
An inner shaft gripping step of gripping one end of the inner shaft after the bonding step with an inner shaft side jig;
An outer shaft gripping step of gripping one end of the outer shaft after the bonding step with an outer shaft side jig;
In a state where one end of the inner shaft and one end of the outer shaft are grasped, the inner shaft jig and the outer shaft jig are relatively reciprocated along the axial direction of the spline telescopic shaft, After finishing the resin coating layer before the finish according to the corresponding outer spline or the inner spline while centering the inner shaft or the outer shaft in at least one of the inner shaft side jig and the outer shaft side jig And a resin coating layer finishing step of forming a resin coating layer of

  According to the above configuration, the inner shaft side jig grips the inner shaft, the outer shaft side jig grips the outer shaft, and at least one of the inner shaft jig and the outer shaft jig aligns the inner shaft or the outer shaft Since the inner shaft side jig and the outer shaft side jig are reciprocated relative to each other along the axial direction of the spline extension shaft while being allowed to move, the resin coating layer before finishing is softened by frictional heat or the like to form a spline shape A uniform film thickness can be obtained without deviation when copying.

In the second invention, in the first invention,
In the resin coating layer finishing step,
The inner shaft is movably supported in the radial direction by balls disposed in the grooves formed in the inner shaft side jig, and while centering the inner shaft, and / or
The outer shaft is movably supported in the radial direction by a ball arranged in a groove formed in the outer shaft side jig, and the outer shaft is centered.
The inner shaft side jig and the outer shaft side jig are relatively reciprocated along the axial direction of the spline telescopic shaft.

  According to the above configuration, by radially movably supporting at least one of the inner shaft and the outer shaft with the ball, the centripetal action automatically acts when the relative sliding movement between the inner shaft and the outer shaft is performed. The center is uniform and the resin coating layer is finished uniformly.

In the third invention, in the second invention,
In the inner shaft gripping step,
While clamping and fixing one end of the inner shaft by the clamp mechanism of the inner shaft side jig, a universal joint is connected to the clamp mechanism,
In the resin coating layer finishing step,
In the state where the one end of the outer shaft is supported movably in the radial direction by the balls of the outer shaft side jig, the resin coating layer before the finish is made to correspond to the outer spline or the inside while centering the outer shaft. The resin coating layer after finishing is formed according to the spline.

  According to the above configuration, by temporarily coupling the universal joint to one end of the inner shaft, the vertical vibration generator conventionally used can also be used. In addition, a centripetal action is exerted on the outer shaft, and the center is aligned by the action of the universal joint, so that the resin coating layer is finished uniformly.

In the fourth invention, in the third invention,
In the outer shaft gripping step,
The outer shaft is inserted from the opening of the outer shaft side jig body in which the C-shaped groove is formed, and a part of the outer shaft is placed on the ball disposed in the C-shaped groove.

  According to the above configuration, the outer shaft can be easily inserted into the outer jig body from the opening side, and the inserted outer shaft is movably supported by the ball in the C-shaped groove, so spline expansion and contraction are possible. A centripetal action is prompted when the shaft slides.

In the fifth invention, in the third invention,
In the outer shaft gripping step,
The outer shaft is inserted from the opening of the outer shaft side jig body in which a pair of linear grooves are formed, and a part of the outer shaft is placed on the balls disposed in the pair of linear grooves. Do.

  According to the above configuration, the outer shaft can be easily inserted into the outer-shaft-side jig body from the opening side, and the inserted outer shaft is movably supported by the balls in the pair of linear grooves. A centripetal action is prompted when the telescopic shaft slides. It is difficult to support evenly in the circumferential direction, especially when a pair of pins extending radially outward is provided at one end of the outer shaft, but with the balls disposed in the respective linear grooves If supported, the centripetal action works properly.

In the sixth invention, in the fourth or fifth invention,
In the outer shaft gripping step,
A part of the outer shaft is supported by the ball via a workpiece receiver fitted with a predetermined gap to the inner surface of the groove.

  According to the above configuration, since the work receiver is supported by the rotating ball in the range of the predetermined gap, the alignment of the outer shaft is easy.

In a seventh invention, in any one of the fourth to sixth inventions,
In the outer shaft gripping step,
One end of the outer shaft is pressed in a state in which the ball of the bearing abuts.

  According to the above configuration, since one end of the outer shaft is pressed down through the ball of the bearing, the outer shaft is held without inhibiting the centripetal operation of the outer shaft.

  As described above, according to the present invention, even with a spline telescopic shaft in a difficult-to-clamp state where no universal joint is provided, sliding is performed while centripetally moving the outer shaft and the inner shaft of the spline telescopic shaft. The resin coating layer after finishing can be molded easily and accurately.

It is an IA section enlarged front view of FIG. It is the IB-IB sectional view taken on the line of FIG. 1A. It is the IC-IC sectional view taken on the line of FIG. 1A. It is a front view which shows the state which held the intermediate shaft which concerns on Embodiment 1 in the up-down vibration generator. FIG. 3 is an enlarged cross-sectional view of a portion IIIA of FIG. 2; It is the IIIB-IIIB line sectional view of Drawing 3A. It is the FIG. 1A equivalent view which concerns on Embodiment 2. FIG. It is the IVB-IVB sectional view taken on the line of FIG. 4A. It is the IVC-IVC line sectional view of Drawing 4A. It is the FIG. 3A equivalent view which concerns on Embodiment 2. FIG. It is a VB-VB line sectional view of Drawing 5A. It is the FIG. 3A equivalent view which concerns on Embodiment 3. FIG.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

(Embodiment 1)
FIG. 2 shows a state in which the intermediate shaft 1 as a spline telescopic shaft according to the first embodiment of the present invention is gripped by a vertical vibration generator (not shown), and in this intermediate shaft 1, the inner spline 2a is the inner periphery An outer shaft 2 formed on the surface, and an inner shaft 3 formed on the outer peripheral surface of the outer spline 3a and slidably coupled to the outer spline 3a and the inner spline 2a. Although not shown in detail, in the present embodiment, the outer splines 3a are covered with the resin coating layer 4 before finishing. The resin coating layer 4 before this finishing may be provided only on the inner spline 2a side, or may be provided on both the outer spline 3a and the inner spline 2a. As shown by a two-dot chain line in FIG. 1A, a ring-shaped flange 5 is provided at the upper end of the outer shaft 2. On the other hand, as shown in FIG. 3A, at the lower end of the inner shaft 3, a connecting spline 3b for connecting a universal joint or the like is processed. As also shown in FIG. 3B, a part of the portion where the connecting spline 3b is processed is machined to form a flat pressed portion 3c. In the intermediate shaft 1 of the present embodiment, the resin coating layer 4 before finishing is formed, and the inner shaft 3 and the outer shaft 2 on which the resin coating layer 4 before finishing is formed are the outer spline 3a and the inner spline 2a. It is slidably coupled. In this state, the universal joint is not attached to either the inner shaft 3 or the outer shaft 2 as in the prior art.

  Then, in a state in which the resin coating layer 4 before the finishing is formed, the outer diameter of the resin coating layer 4 before the finishing of the outer spline 3a and the inner diameter of the inner spline 2a of the outer shaft 2 are in a negative clearance state. It has become. If used as it is, there is a problem that the gap between the resin coating layer 4 before finishing and the spline groove may be formed unevenly. For this reason, finish processing of the resin coating layer 4 before this finish is needed.

  Next, a method of manufacturing the intermediate shaft 1 according to the present embodiment will be described.

  First, in the resin coating layer forming step, the outer splines 3a are coated with a resin material to prepare the inner shaft 3 and the outer shaft 2 on which the resin coating layer 4 before finishing is formed. Although it does not specifically limit as a resin material, For example, nylon resin etc. are used.

  Next, in the bonding step, the outer splines 3a and the inner splines 2a are slidably coupled to the inner shaft 3 and the outer shaft 2 on which the resin coating layer 4 before finishing is formed. At this time, a bias may exist between the outer diameter of the resin coating layer 4 before finishing the outer spline 3a and the inner diameter of the inner spline 2a of the outer shaft 2.

  Next, in the inner shaft gripping step, one end (lower end) of the inner shaft 3 after the bonding step is gripped by the inner shaft side jig 30. Specifically, as shown in FIGS. 3A and 3B, the lower end of the inner shaft 3 is gripped and fixed by the clamp mechanism of the inner shaft side jig 30, and the universal joint is connected to the clamp mechanism. The inner-shaft-side jig 30 has an inner-shaft-side jig body 31 having an outer-peripheral taper surface 31a whose outer diameter gradually increases from the upper and lower middle toward the upper side, and an inner-peripheral taper surface 32a corresponding to the outer-peripheral taper surface 31a. And a cylindrical clamper 32 externally fitted to the inner-shaft-side jig body 31. The inner shaft side jig main body 31 is provided with a wedge member 33 inserted movably in the radial direction, and in the process of raising the clamper 32 with respect to the inner shaft side jig main body 31, the wedge member 33 has a radius The lower end of the inner shaft 3 is rigidly fixed to the inner shaft side jig 30 by the radially inward projecting portion 33a of the wedge member 33 coming into contact with the pressed portion 3c of the lower end of the inner shaft 3. Clamped on. The inner shaft side jig body 31, the clamper 32, and the wedge member 33 constitute a clamp mechanism.

  Although the order may be reversed with the inner shaft gripping step, one end (upper end) of the outer shaft 2 is gripped by the outer shaft side jig 20 in the outer shaft gripping step. Specifically, as shown in FIGS. 1A to 1C, the outer-shaft-side jig 20 includes an outer-shaft-side jig body 21 in which a C-shaped groove 22 is formed. The C-shaped groove 22 is, for example, an arc-shaped groove having a constant radius, and a similar arc-shaped lower wear plate 24 is provided at the bottom of the groove. Furthermore, a suitable number of balls 23 made of steel balls are accommodated. The ball 23 may be used to prevent biting of the ball 23 or to stop the C-shaped groove 22 using a cage having an appropriate shape. An arc-shaped upper wear plate 25 is also mounted thereon. The lower wear plate 24 and the upper wear plate 25 do not necessarily have to be provided, and may not be provided. An arc-shaped workpiece receiver 26 is also provided on the upper wear plate 25. The workpiece receiver 26 has a lower portion 26a fitted in the C-shaped groove 22. The lower portion 26a has a clearance of X1 in the X direction and Y1 in the Y direction between the lower portion 26a and the inner surface of the C-shaped groove 22. The workpiece receiver 26 can freely move in the radial direction of the intermediate shaft 1 on the outer-shaft-side jig body 21 within the range of the gaps X1 and Y1. For example, the gap is set to X1 = Y1 = 0.5 mm. A floating mechanism is formed in which the outer shaft 2 can move in a plane (XY plane) perpendicular to the axial direction of the intermediate shaft 1 within the range of the gap. Then, the outer shaft 2 is inserted from the opening 27 of the outer shaft side jig main body 21 in which the C-shaped groove 22 is formed, and the flange portion 5 of the outer shaft 2 is placed on the ball 23 disposed in the C-shaped groove 22. Place the. A seat in which the flange portion 5 is fitted may be provided on the upper surface of the workpiece receiver 26.

  Then, the upper end of the outer shaft 2 is pressed by the pressing jig 10. Specifically, the holding jig 10 includes a holding jig main body 11 and a cylindrical work holding member 12 having a projection at a lower end fitted into the holding jig main body 11. The upper end of the outer shaft 2 is pressed down by the lid 14 via the ball of the bearing 13. At this time, since the upper end of the outer shaft 2 is pressed down via the ball of the bearing 13, the outer shaft 2 is held without inhibiting the centripetal operation of the outer shaft 2. The work presser 12 is fixed so as not to be separated from the presser jig main body 11 by a stopper or the like (not shown). As the bearing 13, it is preferable to use a thrust bearing that can receive an axial force of the spline telescopic shaft 1.

  Next, in the resin coating layer finishing step, with the lower end of the inner shaft 3 and the upper end of the outer shaft 2 grasped, the inner shaft side jig 30 and the outer shaft side jig 20 are relative to the shaft of the intermediate shaft 1 The resin coating layer 4 before finishing is made to conform to the corresponding outer splines 3 a or inner splines 2 a while reciprocating the movement along the direction and centering the outer shaft 2 in the outer shaft side jig 20. For example, the inner shaft side jig 30 side may be fixed, and the outer shaft side jig 20 may be reciprocated up and down.

  As described above, in the present embodiment, when the relative sliding movement between the inner shaft 3 and the outer shaft 2 is performed, the outer shaft side jig 20 automatically acts as a centripetal action, and the resin coating layer is finished after the centers are aligned. 4 is the uniform finish.

  In addition, by temporarily coupling a universal joint to the lower end of the inner shaft 3, a vertical vibration generator which has been conventionally used can also be used.

  Furthermore, since the outer shaft 2 can be easily inserted into the outer jig 21 from the opening 27 side, and the inserted outer shaft 2 is movably supported by the balls 23 in the C-shaped groove 22, At the time of movement, the centripetal action is prompted.

  Further, in the outer shaft gripping step, the flange portion 5 of the outer shaft 2 is supported on the ball 23 via the work receiver 26 fitted into the C-shaped groove 22 with the predetermined gaps X1 and Y1 maintained. Since the workpiece receiver 26 is supported by the ball 23 rotating in the range of the predetermined gaps X1 and Y1, the centering of the outer shaft 2 is easy.

  Therefore, according to the manufacturing method of the intermediate shaft 1 according to the present embodiment, the outer shaft 2 and the inner shaft 3 of the intermediate shaft 1 are made to slide while being centered on each other, and the resin coating layer 4 after finishing is simply and precisely. It can be molded.

Second Embodiment
FIGS. 4A-5B show Embodiment 2 of the present invention, which differs from Embodiment 1 in that the shape of the intermediate shaft 101 and the fixing structure thereof are different. In the following embodiments, the same parts as those in FIG. 1A to FIG. 3B are assigned the same reference numerals and detailed explanations thereof will be omitted.

  In the present embodiment, first, as shown in FIGS. 4A to 4C, the shape of the upper end 104 of the intermediate shaft 101 is different from that of the first embodiment. Specifically, the upper end of the outer shaft 102 is provided with a pair of pins 105 instead of the flange portion 5. Therefore, the configuration of the outer-shaft-side jig 120 is different from that of Embodiment 1 according to this shape.

  Specifically, in the present embodiment, unlike the above embodiment, a pair of linear grooves 122 instead of the C-shaped groove 22 is formed in the outer-shaft-side jig body 121. An opening 27 is formed between the pair of linear grooves 122 as in the first embodiment.

  The same holding jig 10 as that of the first embodiment is used. The second embodiment differs from the first embodiment in that only the work presser 112 in the presser jig 10 is vertically elongated in accordance with the shape of the outer shaft 102.

  The inner shaft side jig 130 may be the same as that of the first embodiment, but in the present embodiment, the inner shaft side jig 130 as shown in FIGS. 5A and 5B is used. At the lower end of the inner shaft 103 of the intermediate shaft 101 of the present embodiment, a groove-shaped pressed portion 103c is formed over the entire circumference. According to this shape, four wedge members 133 each having a protrusion 133a at the tip and a slope 133b at the base end are provided. The number of the wedge members 133 may be three or less.

  The inner-shaft-side jig 130 of the present embodiment corresponds to the inner-shaft-side jig main body 131 having an outer peripheral tapered surface 131a whose outer diameter gradually increases from the upper and lower middle toward the lower side, and the outer peripheral tapered surface 131a. A cylindrical clamper 132 having an inner peripheral tapered surface 132 a and fitted on the inner shaft side jig main body 131 is provided. As described above, the inner shaft side jig main body 131 is provided with the four wedge members 133 inserted movably in the radial direction, and the clamper 132 is lowered relative to the inner shaft side jig main body 131 In the process, the four wedge members 133 are pressed radially inward, and the radially inward projecting portions 133a of the wedge members 133 abut the pressed portions 103c at the lower end of the outer shaft 2, whereby the lower end of the inner shaft 103 is reduced. Are firmly clamped to the inner shaft side jig 130. For example, in the present embodiment, the male screw 131 b is provided on the lower side of the inner jig main body 131, and the female screw 132 b is provided at the lower end of the clamper 132 to gradually tighten the wedge member 133 by rotating the clamper 132. It can be done. The inner shaft side jig main body 131, the clamper 132 and the wedge member 133 constitute a clamp mechanism. The inner shaft 103 on which the pressed portion 103c is formed may be held by the inner shaft side jig 30 of the first embodiment.

  In the present embodiment, in the outer shaft gripping step, the outer shaft 2 is inserted from the opening 27 of the outer-shaft-side jig main body 21 in which the pair of linear grooves 122 is formed, and arranged in the pair of linear grooves 122 A pair of pins 105 which are a part of the outer shaft 102 are placed on the ball 23. Specifically, as in the first embodiment, the pair of pins 105 is supported by the ball 23 via the workpiece receiver 126. Also in the present embodiment, the gaps X2 and Y2 are provided between the workpiece receiver 126 and the linear groove 122, respectively. For example, X2 = Y2 = 0.5 mm. As a result, the workpiece receiver 126 can move in the radial direction of the intermediate shaft 101 within the range of these gaps, so that a floating mechanism in which the outer shaft 102 can move in the radial direction (within the XY plane) is formed. ing. A seat into which the pin 105 is fitted may be provided on the upper surface of the workpiece support 126.

  By configuring in this manner, in the present embodiment as well, the resin coating layer finishing step is performed as in the above embodiment.

  Also in the present embodiment, the outer shaft 102 can be easily inserted into the outer jig 21 from the opening 27 side, and the inserted outer shaft 102 is movably supported by the balls 23 in the pair of linear grooves 122. Be done. For this reason, the centripetal action is surely prompted when sliding. In particular, in the case where a pair of pins 105 extending radially outward is provided at the upper end of the outer shaft 102, it is difficult to uniformly support in the circumferential direction, but the pair of pins 105 are arranged in the respective linear grooves 122 If supported by the ball 23, the centripetal action works properly, and the resin coating layer 4 with a substantially uniform thickness is formed.

  Therefore, also in the manufacturing method of the intermediate shaft 101 according to the present embodiment, the outer shaft 102 and the inner shaft 103 of the intermediate shaft 101 are made to slide while being made to be centered and the resin coating layer 4 after finishing is simply and accurately performed. It can be molded. Further, by thus devising the shapes of the outer shaft side jig 120 and the inner shaft side jig 130, the spline telescopic shaft of various shapes is clamped, and the finish of the resin coating layer 4 after uniform finishing is completed. It can be processed.

(Embodiment 3)
FIG. 6 shows Embodiment 3 of the present invention, and differs from Embodiments 1 and 2 in that the support structure of the intermediate shaft 201 is different.

  That is, in the present embodiment, although not shown in detail, a cylindrical mass 203 a is provided at the lower end portion of the inner shaft 203 of the intermediate shaft 201. For this reason, the shape of the inner shaft side jig 230 is different.

  Specifically, the inner-shaft-side jig 230 includes a bottomed cylindrical inner-shaft-side jig main body 231 and a disc-like clamper 232, and a shaft presser having a through hole corresponding to the cylindrical block 203a. It has 233. The cylindrical block 202a is accommodated in the inner jig body 231 while the outer periphery of the cylindrical block 203a is covered with the cylindrical shaft press 233. In this state, the clamper 232 holds the shaft press 233 from the upper side. The inner shaft 203 is reliably fixed to the inner shaft side jig 230 by attaching and fastening the inner shaft side jig main body 231 with a bolt or the like. The shaft presser 233 may be divided into, for example, two planes extending in the vertical direction.

  The pseudo universal joint 40 is fixed to the lower end of the inner shaft 203 fixed to the inner shaft side jig 230 as in the above embodiments.

  This fixing method may be combined with any of the outer shaft side jigs 20 and 120 of the first and second embodiments.

  In the case of the method of fixing the inner shaft 203 of the present embodiment, since the cylindrical block 203a is reliably prevented from coming off, the inner shaft 203 does not come out even if it is connected to the vertical vibration generating device to apply vertical vibration.

(Other embodiments)
The present invention may be configured as follows for the above embodiment.

  That is, in the above embodiment, in the resin coating layer finishing step, the upper end of the outer shaft is supported so as to be capable of centrifuging, but the inner shaft is made radial with the balls 23 disposed in the groove formed in the inner shaft side jig. The inner shaft side jig and the outer shaft side jig may be reciprocated relative to each other along the axial direction of the intermediate shaft while being movably supported to center the inner shaft. Also in this case, the inner shaft side jig and the outer shaft side jig are relatively reciprocated along the axial direction of the intermediate shaft while centering the inner shaft in the inner shaft side jig. The formation of a biased gap between the resin coating layer 4 and the corresponding outer spline 3a or inner spline 2a is prevented, and the gap can be adjusted uniformly and precisely. In addition, it may be made to reciprocate while centering both the outer shaft and the inner shaft.

  In each of the above embodiments, although an example of the intermediate shaft is shown as the spline telescopic shaft, the present invention is not limited to this, but the main point is that the outer spline formed on the inner peripheral surface and the outer spline formed on the outer peripheral surface And the spline telescopic shaft in which at least one of the inner spline and the outer spline is coated with the resin coating layer 4 after finishing, The application is not limited.

  The above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and uses.

1 Intermediate shaft (spline telescopic shaft)
2 Outer shaft
2a internal spline
3 inner shaft
3a Outer spline
3b Spline for connection
3c Pressed part
4 (pre-finish, finish) resin coating layer
5 Flange part
10 jigs
11 Jig body
13 Bearings
14 lid
20 Outer shaft side jig
21 Outer shaft side jig body
22 C-shaped groove
23 balls
24 lower wear plate
25 upper wear plate
26 Workpiece
26a lower part
27 Opening
30 inner shaft side jig
31 Inner shaft side jig body (clamp mechanism)
32 Clamper (clamp mechanism)
33 楔 member (clamping mechanism)
33a protrusion
40 pseudo universal joints
X1, Y1 Clearance 101 Intermediate shaft (Spline telescopic shaft)
102 Outer shaft 103 Inner shaft 103c Pressed portion 105 Pin 120 Outer shaft side jig 121 Outer shaft side jig body 122 Linear groove 126 Workpiece receiving 130 Inner shaft side jig 131 Inner shaft side jig body (clamp mechanism)
132 Clamper (clamp mechanism)
133 楔 member (clamping mechanism)
133a protrusion
X2, Y2 Clearance 201 Intermediate shaft (Spline telescopic shaft)
203 inner shaft 203a cylindrical block 230 inner shaft side jig 231 inner shaft side jig body 232 clamper

Claims (7)

An outer shaft having an inner spline formed on an inner circumferential surface,
An outer shaft is formed on the outer peripheral surface, and an inner shaft slidably coupled with the outer spline and the inner spline,
In a method of manufacturing a spline telescopic shaft in which at least one of the inner spline and the outer spline is coated with a resin coating layer,
A resin coating layer forming step prior to finishing, wherein at least one of the inner spline and the outer spline is coated with a resin material to form the resin coating layer;
Combining the inner shaft and the outer shaft on which the resin coating layer before the finish is formed so that the outer spline and the inner spline can slide.
An inner shaft gripping step of gripping one end of the inner shaft after the bonding step with an inner shaft side jig;
An outer shaft gripping step of gripping one end of the outer shaft after the bonding step with an outer shaft side jig;
In a state where one end of the inner shaft and one end of the outer shaft are grasped, the inner shaft jig and the outer shaft jig are relatively reciprocated along the axial direction of the spline telescopic shaft, Resin after finishing by making the resin coating layer before finishing follow the corresponding outer spline or inner spline while centering the inner shaft or the outer shaft in at least one of the inner shaft side jig and the outer shaft side jig And a resin coating layer finishing step of forming a coating layer. In the method of manufacturing a spline telescopic shaft according to claim 1,
In the resin coating layer finishing step,
The inner shaft is movably supported in the radial direction by balls disposed in the grooves formed in the inner shaft side jig, and while centering the inner shaft, and / or
The outer shaft is movably supported in the radial direction by a ball arranged in a groove formed in the outer shaft side jig, and the outer shaft is centered.
A method of manufacturing a spline telescopic shaft, wherein the inner shaft side jig and the outer shaft side jig are relatively reciprocated along the axial direction of the spline telescopic shaft. In the method of manufacturing a spline telescopic shaft according to claim 2,
In the inner shaft gripping step,
While clamping and fixing one end of the inner shaft by the clamp mechanism of the inner shaft side jig, a universal joint is connected to the clamp mechanism,
In the resin coating layer finishing step,
In a state where one end of the outer shaft is supported movably in the radial direction by the balls of the outer shaft side jig, while centering the outer shaft, the resin coating layer before the finish is made to the corresponding outer spline or inner spline A method for producing a spline telescopic shaft characterized in that a resin coating layer after finishing is formed by copying. In the method of manufacturing a spline telescopic shaft according to claim 3,
In the outer shaft gripping step,
Insert the outer shaft from the opening of the outer shaft side jig main body in which the C-shaped groove is formed, and place a part of the outer shaft on the ball disposed in the C-shaped groove A method of manufacturing a spline telescopic shaft characterized by In the method of manufacturing a spline telescopic shaft according to claim 3,
In the outer shaft gripping step,
The outer shaft is inserted from the opening of the outer shaft side jig body in which a pair of linear grooves are formed, and a part of the outer shaft is placed on the balls disposed in the pair of linear grooves. A manufacturing method of a spline telescopic shaft characterized by doing. In the method of manufacturing a spline telescopic shaft according to claim 4 or 5,
In the outer shaft gripping step,
A manufacturing method of a spline telescopic shaft characterized in that a part of the outer shaft is supported by the ball via a workpiece receiver fitted with a predetermined gap kept on the inner surface of the groove. In the method of manufacturing a spline telescopic shaft according to any one of claims 4 to 6,
In the outer shaft gripping step,
A manufacturing method of a spline telescopic shaft characterized in that one end of the outer shaft is pressed in a state in which a ball of a bearing is in contact.

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